This release contains multiple under-the-hood improvements as well as a bug fix to a race condition involving timeout and interrupt.

What's Changed

• Fix reference for "ZPipeline.splitOn merges adjacent strings together" #10050 by @bahuber in https://github.com/zio/zio/pull/10169
• Optimize ZLayer initialization by @kyri-petrou in https://github.com/zio/zio/pull/10219
• Add methods for sequential composition of ZLayers by @kyri-petrou in https://github.com/zio/zio/pull/10218
• zio-test: Improve ExecuteSpecs.getOutputsAndEvents code by @guizmaii in https://github.com/zio/zio/pull/10231
• Optimize ZIO::once by @guizmaii in https://github.com/zio/zio/pull/10240
• zio-test: Ignored annotated suites should not trigger shared layer creation by @guizmaii in https://github.com/zio/zio/pull/10234
• zio-test: Optimise Spec code by @guizmaii in https://github.com/zio/zio/pull/10230
• Fix race condition involving race and interruption by @kyri-petrou in https://github.com/zio/zio/pull/10258
• zio-test: remove unnecessary lazy vals by @hearnadam in https://github.com/zio/zio/pull/10259
• Runtime: use Internal abstract class to make unsafe a val by @hearnadam in https://github.com/zio/zio/pull/10250
• Remove configurability of 'isFatal' by @hearnadam in https://github.com/zio/zio/pull/10212

Other changes (CI, dependencies and documentation)

• Update spring-core to 6.2.12 by @zio-scala-steward[bot] in https://github.com/zio/zio/pull/10201
• Bump actions/upload-artifact from 4 to 5 by @dependabot[bot] in https://github.com/zio/zio/pull/10211
• Bump actions/download-artifact from 5 to 6 by @dependabot[bot] in https://github.com/zio/zio/pull/10210
• Update sbt-scalafmt to 2.5.6 by @zio-scala-steward[bot] in https://github.com/zio/zio/pull/10213
• Bump actions/setup-node from 5 to 6 by @dependabot[bot] in https://github.com/zio/zio/pull/10203
• Update junit-platform-engine to 6.0.0 by @zio-scala-steward[bot] in https://github.com/zio/zio/pull/10184
• Bump coursier/cache-action from 6 to 7 by @dependabot[bot] in https://github.com/zio/zio/pull/10217
• Update reactor-core to 3.7.13 by @zio-scala-steward[bot] in https://github.com/zio/zio/pull/10221
• Bump JamesIves/github-pages-deploy-action from 4.7.3 to 4.7.4 by @dependabot[bot] in https://github.com/zio/zio/pull/10225
• Update snakeyaml-engine to 3.0 by @zio-scala-steward[bot] in https://github.com/zio/zio/pull/10227
• Update spring-core to 6.2.13 by @zio-scala-steward[bot] in https://github.com/zio/zio/pull/10229
• Update snakeyaml-engine to 3.0.1 by @zio-scala-steward[bot] in https://github.com/zio/zio/pull/10228
• Update spring-core to 7.0.0 by @zio-scala-steward[bot] in https://github.com/zio/zio/pull/10235
• Update izumi-reflect to 3.0.7 by @zio-scala-steward[bot] in https://github.com/zio/zio/pull/10236
• Bump actions/checkout from 5.0.0 to 5.0.1 by @dependabot[bot] in https://github.com/zio/zio/pull/10238
• Update junit-platform-engine to 6.0.1 by @zio-scala-steward[bot] in https://github.com/zio/zio/pull/10215
• Fix ZPipeline Type Parameters in Documentation by @khajavi in https://github.com/zio/zio/pull/10242
• Update spring-core to 7.0.1 by @zio-scala-steward[bot] in https://github.com/zio/zio/pull/10245
• Return interop-cats ecosystem page by @neko-kai in https://github.com/zio/zio/pull/10244
• Fix Type Parameters and Clarity in ZSink Documentation by @khajavi in https://github.com/zio/zio/pull/10243
• Ref Documentation: Atomic Modify with Continuation by @khajavi in https://github.com/zio/zio/pull/10241
• Bump actions/checkout from 5.0.1 to 6.0.0 by @dependabot[bot] in https://github.com/zio/zio/pull/10253
• Bump peter-evans/create-pull-request from 7.0.8 to 7.0.9 by @dependabot[bot] in https://github.com/zio/zio/pull/10252
• Bump actions/create-github-app-token from 2.1.4 to 2.2.0 by @dependabot[bot] in https://github.com/zio/zio/pull/10251

New Contributors

• @bahuber made their first contribution in https://github.com/zio/zio/pull/10169

Full Changelog: https://github.com/zio/zio/compare/v2.1.22...v2.1.23